Distributed Internet systems modeling using TCPNs

HTCPNs–Based Modelling and Evaluation of Dynamic Computer Cluster Reconfiguration

“…In most solutions at hoc experimental systems are constructed and analysed to prove the benefits of the improvement proposed [14,15,16,10,19,20,11,12]. Research reported in this paper and our previous works [3,4,25,5,6,7] aim at systematisation of modern Internet system development techniques into one consistent methodology. Inspired by research described in [32,2,33] we decided to propose both methodology and software tool based on application of Hierarchical Timed Coloured Petri nets and Queueing Systems, and providing systematic modelling and performance analysis of Internet systems.…”

“…Current Internet (or web) servers usually have distributed multi-tier structure [1,2,3,4,5,6,7,8]. Each tier consist of one or more computers and constitutes a hardware platform for layers of a distributed software system running on it.…”

“…This distributed multi-tier development approach enables natural scalability and redundancy of both hardware and software modules of the system. Current Internet servers are developed to efficiently serve an average frequency of requests stream, and to "survive" transient overloads [1,2,3,4,8]. The typical development procedure covers: estimation of hardware/software performance parameters of system components and performance analysis of prototype or model of the system under different load.…”

“…The research reported in this paper constitute a part of long-term programme that concentrates on applications of Hierarchical Timed Coloured Petri Nets (HTCPNs) [23,24] for distributed Internet systems modelling, development, and performance evaluation [3,4,25,5,6,7]. The main aim of the programme is to acquire the systematic HTCPNs-based method for Internet systems development.…”

“…So far preliminary HTCPNs based Internet systems modelling and analysis was introduced [4,25], and also more mature methodology for systematic modeling and analysis was proposed [3,5,6]. The modelling framework was used for current Internet systems modelling [3,4], analyses of admission control [25] and scheduling [7] of Internet requests algorithms, and selected cluster load balancing policies modelling and evaluation [5,6]. In this paper the method will be extended by a dynamic cluster reconfiguration algorithm model and its performance analysis.…”